/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.example.hrpc.rpc.core;

import io.netty.channel.Channel;
import org.example.hrpc.common.URL;
import org.example.hrpc.common.exception.RemotingException;
import org.example.hrpc.common.exception.RpcException;
import org.example.hrpc.common.spi.annodation.SPI;

/**
 * Protocol. (API/SPI, Singleton, ThreadSafe)
 */
@SPI("hrpc")
public interface Protocol {

    /**
     * Get default port when user doesn't config the port.
     *
     * @return default port
     */
    int getDefaultPort();

    /**
     */
    <T> Exporter<T> export(Invoker<T> invoker) throws RpcException;

    /**
     */
    <T> Invoker<T> refer(Class<T> type, URL url) throws RpcException;

    Invoker<?> getInvoker(Channel channel, Invocation inv) throws RemotingException;

    /**
     * Destroy protocol: <br>
     * 1. Cancel all services this protocol exports and refers <br>
     * 2. Release all occupied resources, for example: connection, port, etc. <br>
     * 3. Protocol can continue to export and refer new service even after it's destroyed.
     */
    void destroy();




}